Dry disinfectant for seeds



Patented eb. 22, 1938 "UNITED STATES PATENT OFFICZE.

2,109,143 I I DRY DISINFECTANT 'ron sums Fritz Wolfl', Berlin, Germany, assignorto Schering-Kahlbaum A. G., Berlin, Germany, a corporation of Germany No Drawing. Application March 20 1934, Serial No. 716,503. In Germany March 22, 1933 8 Claims. (Cl. 167-38) This invention relates to dry disinfectant for bined in a stable form with the substance seeds and more particularly to non-dusting dry claimed.

disinfectants. The following examples serve to illustrate the It is known that the dusting of dry disinfectinvention without, however, limiting the latter ants may be prevented by the addition of certain to the same. 5

oils, such as petroleum oils, resin oil and some Example 1 others; But the latter has a detrimental in- Grams fiuence upon the fungicidal power of the dis- Mercury chloride 5 infectant in case the fungicide contained therein Wool fat 2 is water-soluble and present only in compara- Isocholesterin 10 tively small quantities. To illustrate this detri- Lanoli-n mental effect of the addition of such oils to said Lecithin type of seed disinfectants the following examples Water 3 are given: Talcum 90 Dry seed disinfectant consisting of 5% of. mer- 15 cury chloride and 95% of talcum and applied in Example 2 concentrations of 2:1000 yields bunt-free wheat. Grams The same disinfectant consisting of 5% of Mercury chloride 5 mercury chloride, 90% of talcum and 5% of Isocholestenn 4 2O parafiin oil still shows some bunt ears. Talcum 91 The reason for the insufficient fungicidal Example 3 power of a, seed disinfectant containing such oils Grams in order to prevent excessive dusting is that the Mercurm y c oride 5 action of the mercury chloride is partly pre- Lammn 5 vented by the water-insoluble oil film covering Talcum 9O 25 the fungicide.

One object of this invention consists in elimi- Example 4 nating this disadvantage and in producing non- Grams dusting seed disinfectants of high efficiency. Mercury c l d 5 For this purpose fatty substances possessing a I l t i '2 30 high water-absorbing capacity are added to the w t 3 latter instead of the water-insoluble oils used T l a 90 hitherto. Such substances are for instance, wool fat, wool wax, lanolin, isocholesterin and Example5 the like. Wool fat is capable of absorbing at Grams 35 room temperature 2 times its weight of water rc y C o 5 whereby a salve-like stable mass isformed, which ecithin 4 is especially suitable for the purpose in question. alcum 91 It has furthermore been found that the addi- 40 tion of the above mentioned substances exerts a very favorable influence upon the adhesive capacity of the seed disinfectants. Thereby the Instead of mercury chloride other fungicidal substances or mixtures of the same may also be 40 used, as follows from the further examples:

amount of said addition can be increased without Example 6 reducing the fungicidal power until a friable vGrams mass is Obtainefl- Ortho hydroxyphenyl mercury chlorlde.. 10 45 When using only small amounts of water- Lanolm 4 soluble fungicides the additions claimed offer Tait-11m 86 the advantage that the fungicide can be dissolved in water and added to said additions whereupon Example 7 the filling material is gradually impregnated with Grams 50 the mixture of the fungicide and the addition, Anhydride of the hydroxyphenyl mercury which prevents the dusting and increases the hydr adhesive capacity of the seed disinfectant; The Brought into solution by phenol 16 water present has no disturbing effect upon the Lecithin 5 proportions of said disinfectants; for, it is com- Ka 71 Example 8 Grams Sodium salt of. the cyano mercury cresol 10 Water 10 Isocholesterin "lalcum 75 Example 9 1 Grams Sodium salt of .the para hydroxy phenyl mercury acetate 10 Wool fat 5 Talcum 85 Example 10 Grams .Copper ethyl sulfate Wool wax 10 Talcum -4 70 Example 11 Grams Methyl mercury nitrate 5 Lecithin 5 Kaolin 90 Wheat infected by bunt (Tillctia trz'tzci) is treated with said disinfectants preferably in the proportion of 2:1000. The power of germination is between 98 to 99% within 5 days while no bunt ears are observed. The above disinfectants do not dust and show an excellent adhesive capacity. They are excellent disinfectant agents not only against the bunt of wheat (Tilletia tritici) but are also effective against other seed diseases as for instance the stripedisease of barley (Helminthosporium gramineum), the late smut of cats (Ustilago avenaz) etc.

It has been ascertained that an addition of a compound of arsenic to the above stated preparations will further increase their efl'ects, esspecially when applied against root or crown rot (Phoma heme);

To all the above preparations yet other inert substances may be added e. g., kaolin and the different fungicides e. g., copper carbonate, copper chloride, and similar substances, also plant stimulants e. g., manganese chloride and equivalents.

Various changes may be made in the details disclosed in the foregoing specification without departing from the invention and from the principles set forth herein and in the claims annexed hereto.

What I claim is:

1. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising fatty waterinsoluble substances having an absorptive capacity for water taken from the class consisting of lecithin, isocholesterin, wool fat and its components, and fungicidal compounds, said disinfectant being substantially free from waterrepellant fatty and waxy substances.

2. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising fatty waterinsoluble substances having a limited absorptive capacity for water taken from the class consisting of lecithin, isocholesterin, wool fat and its components, water, fungicidal compounds and inert expletive substances, said disinfectant being substantially free from water-repeliant fatty and waxy substances.

' 3. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising fatty waterinsoluble substances having an absorptive capacity for water taken from the class consisting of lecithin, isocholesterin, wool fat and its components, and fungicidal mercury compounds,

said disinfectant being substantially free from water-repell'ant fatty and waxy substances.

4. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising fatty waterinsoluble substances having an absorptive capacity for water taken from the class consisting of lecithin,, isocholesterin, wool fat and its components, and water-soluble fungicidal mercury compounds, said disinfectant being substantially free from water-repellent fatty and waxy substances.

5. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising wool fat, a water-soluble fungicidal mercury compound and inert expletive substances said disinfectant being substantially free from water-repellant fatty and waxy substances.

6. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising fatty waterinsoluble substances having an absorptive capacity for water taken from the class consisting of lecithin, isocholesterin, wool fat and its components, and fungicidal organic mercury compounds, and containing an arsenic compound,-

said disinfectant being substantially free from water-repellant fatty and waxy substances.

7. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising fatty water-insoluble substances having an absorptive capacity for water taken from the class consisting of lecithin, isocholesterin, wool fat and its components, and fungicidal compounds, said compounds being taken from the class consisting of mercury and copper compounds, said disinfectant being substantially free from water-repellant fatty and waxy substances.

8. A non-dusting, dry disinfectant for seeds of good adhering qualities comprising fatty waterinsoluble substances having an absorptive -capacity for water taken from the class consisting of lecithin, isocholesterin, wool fat and its components, and fungicidal organic mercury compounds, said disinfectant being substantially free from water-repellant fatty and waxy substances.

FRI'IZ WOLFF. 

